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WELL CONATRATIONS <br /> Shell-branded Service Station ` <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH TEPH B T E X 8020 8260 DIPE ETBE TAME TBA Methanol Ethanol TOC Water Elevation <br /> uIL u1L u1L u1L u1L u1L u1L u1L u /L u1L u1L u1L u1L u /L MSL ft MSL <br /> SUMP 1111/15/20001 <50 0 1 NA I <0 500 1 <0 500 1 <0 500 1 <0 500 1 <2 50 1 NA I NA I NA I NA NA I NA I NA I NA 1025 NA <br /> RW 06/05/2001 73 NA 10 21 071 56 NA <0 50 NA NA NA NA NA NA NA 534 NA <br /> RW 01/22/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 469 NA <br /> RW 01/30/2003 <50 NA <0 50 <0 50 <0 50 <0 50 NA <0 50 <2 0 <2 0 <2 0 <50 <1 000 <500 NA 474 NA <br /> RW 04/28/2003 Unable to locate NA NA NA NA I NA NA NA NA I N I NA NA NA NA NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, pnor to January 23,2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 8260B, prior to January 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary buy ether <br /> DIPE= Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE Ethyl tertiary butyl ether, analyzed by EPA Method 8260B <br /> TAME=Ternary amyl methyl ether,analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol, analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> RW=Rediscovered well <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n = Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> Page 7 <br />